// Header
#include <conio.h>
#include <stdio.h>
#include <math.h>
#include<stdlib.h>
#include<string.h>
// ====== Define ===========
// ======= Main ============
int main(){
char* str;
str= (char*) calloc(20, sizeof(char));
printf("nhap xau vao: ");
gets(str);
puts("\nxau vua nhap la: ");
puts(str);
int i = 0;
int dai = 0;
while(str[i] != '\0'){
	dai = dai + 1;
    i++;
}
printf("\ndo dai cua xau la: %d ",dai);
getch();
}
// ====== Implements Function

